Enriched Flour. Wheat flour to which have been added, on a per pound basis, 2.9 mg of thiamine (q.v.), 1.8 mg of riboflavin (q.v.), 24 mg of niacin (q.v.), and 20 mg of iron (q.v.), and 960 mg of calcium as an optional ingredient, to conform with the standards of identity (q.v.) for such flour.